# FAC Gravity — Spatial Frequency Shifter AUv3

> Spatial Frequency Shifter AUv3 (iPhone/iPad app by Frederic Corvest.)

- Source: https://appshunter.io/ios/app/fac-gravity/id6799092848 (this page in markdown: same URL + `.md`)
- Developer: [Frederic Corvest](https://appshunter.io/developer/1230164765)
- Category: Music
- Price: $8.49 with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-10-09
- Data updated: 2026-10-09
- User reviews in markdown: https://appshunter.io/ios/app/fac-gravity/id6799092848/reviews.md

## What is FAC Gravity?

FAC Gravity AUv3 Plugin is a frequency shifter for creating Barberpole and Shepard style glissandos, spectral illusions, stereo rotation, chorusing, phasing, evolving echoes, infinite cosmic spaces, and all the combinations you’ll make.

The plugin gives you two ways to process the audio source. In Stereo mode, each channel is shifted independently, with a Ratio control determining how closely their frequency shifts align. In Mono mode, FAC Gravity extends the internal quadrature processing to create a wide stereo image from the mono source.

The frequency shift can move up or down, from subtle to more extreme spectral transformations. You can set the amount in Hz for classic Bode-style frequency shifting, make it follow your host tempo for rhythmic patterns, or even control it from MIDI notes for a more hands-on approach.

A new dimension appears when you let the shifter feed back into itself with Spiral, a customizable loop with delay, blur, filtering, and different characters that shape how the sound circles, smears, interacts, and evolves over time. The result can range from bubbling textures to infinite sustained tones and noisy analog self-oscillation. Each character takes the feedback somewhere different.

To dive deeper into new sonic dimensions, FAC Gravity comes with its own modulation module. The LFO, envelope follower, and flexible modulation matrix let you animate most parameters, from subtle evolving movements to complex, rhythmically reactive changes. You can even make the stereo field animate and rotate continuously by making the Width, Phase, and Pan parameters spin! You can shape the effect further by blending the processed signal with the original, while the optional limiter keeps the most extreme combinations in check.

• Barberpole glissandos, spectral illusions, rotating stereo, evolving echoes
• Dual Frequency Shifting, or Mono Shifting with Quadrature Stereo Widening
• Organic Spiral Loop, from gentle feedback to pure analog self-oscillation
• Integrated delay, diffusion blur, and independent low/high filtering
• Modulation matrix, multi-source envelope follower
• LFO with classic waveforms and random spline
• Spinning modulation to rotate and animate the stereo field
• Tempo-synced or MIDI-driven Frequency Shift, LFO, and Delay
• Dry/Wet mix, optional limiting, and goniometer visualization
• Advanced Responsive Design, portrait and landscape views
• Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro

The documentation is available at fredantoncorvest.com/FAC_Gravity.html

This is an AUv3 Effect and requires a compatible host to work
The in-app purchases are for tipping only, the app is fully functional without them

## Pricing and in-app purchases

Base price: $8.49.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $14.99 | one-time |


## Chart rankings

- #37 in Top Paid · Music (US App Store)


## Version history (last 1 release)

### 1.0 — 2026-10-09

No release notes.

## More apps by Frederic Corvest

- [FAC Chorus](https://appshunter.io/ios/app/fac-chorus/id1230164766)
- [FAC Maxima](https://appshunter.io/ios/app/fac-maxima/id1323117302)
- [FAC Transient](https://appshunter.io/ios/app/fac-transient/id1354088081)
- [FAC Envolver](https://appshunter.io/ios/app/fac-envolver/id1378195291)
- [FAC Bandit](https://appshunter.io/ios/app/fac-bandit/id1458633968)
- [FAC Alteza](https://appshunter.io/ios/app/fac-alteza/id1489369665)

All apps by Frederic Corvest: https://appshunter.io/developer/1230164765

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-09.*